Ablation of Copper Metal Films by Femtosecond Laser Multipulse Irradiation

Ablation of copper using multipulse femtosecond laser irradiation with an 800 nm wavelength and 120-fs pulse duration is investigated theoretically. A two-temperature model, which includes dynamic optical and thermal-physical properties, is considered. The numerical results of the material thermal r...

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Bibliographic Details
Published in:Applied sciences 2018-10, Vol.8 (10), p.1826
Main Authors: Abdelmalek, Ahmed, Bedrane, Zeyneb, Amara, El-Hachemi, Sotillo, Belén, Bharadwaj, Vibhav, Ramponi, Roberta, Eaton, Shane
Format: Article
Language:English
Subjects:
Copper
Efficiency
Explosions
femtosecond laser
Femtosecond pulsed lasers
Fluence
Heat
Irradiation
Laser ablation
Lasers
metal ablation
Metals
Micromachining
Optical properties
Physical properties
Pulse duration
Relaxation time
Separation
Temperature
thermal accumulation effect
Thermal relaxation
Thermal response
two-temperature model
Vaporization
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Summary:Ablation of copper using multipulse femtosecond laser irradiation with an 800 nm wavelength and 120-fs pulse duration is investigated theoretically. A two-temperature model, which includes dynamic optical and thermal-physical properties, is considered. The numerical results of the material thermal response obtained by varying the pulse number, the separation times between pulses and laser fluences are presented. Our results show that the increasing of pulse number with a separation time less than the thermal relaxation time can dramatically enhance the lattice temperature without a noticeable increase in ablation depth. Therefore, we suggest that the vaporization rate can be augmented in comparison to the melting rate during the same single-phase explosion at the same total fluence where a fast heat accumulation effect plays an important role for cleaner ablation during micromachining.
ISSN:2076-3417
2076-3417
DOI:10.3390/app8101826